If I recall Ashley had an even bigger problem and got dinged on 2A's all season long. I think she would be wise to fix up her 2A problems before worrying so much about 3x3's.
I'm sure that she's fixed that by now. We've seen her do plenty of clean 2A's too; so I'm sure it was a minor problem on the jump. If she consistently lands her 3-3 in the practices leading up to Nats, why shouldn't she do it there? If she can match Rachael Flatt's jump layout she can beat her overall thanks to her PCS (I think... unless Rachael suddenly receives a ton of extra USFSA-darling points).
But Ashley incapability of scoring high in the SP worries me; though it might not be a problem at Nats per se. I don't understand why it's been such a problem this season; she scored a respectable 61+ at NHK last year (with a flutz); I think it's more a problem of not getting the levels and GOE on non-jump elements that's been holding her down.